Process of protecting electric and other cables



Aug. 28, 19.28. 1,682,076

.'J. o. GOGRY PROCESS OF PROTECTING ELECTRIC AND CTHER CABLES Filed NOV. 14, 1925 B 7 I 1@ A? y I W///'// l NVENTH" Zag, czeElS/e ATTORNEY Patented Aug. 2s, 192s.

UNITED STATESy PATENT OFFICE.

JEAN OCTAVE GOGRY, OF VINCENNES, FRANCE.

PROCESS OF PROTECTING ELECTRIC AND OTHER CABLES.

AApplication led'November 14, 1925, Serial No. I69,062, and in France November 27, 1924.

Electric conductors at present in use areV a degreethat plant safety does not permit the conductors to be kept in service for long without serious risks.

Chiey dangerous among the said destruc-A tive agents can be mentioned:

1. Moisture at any temperature;

2. Dry heat `above 100 C.

3. Chemicals, either per se or through their emanations, (acids, strong bases, alkalis etc.

4.) Certain products commonly met with in industry (spirits, oil etc.).

The object of my invention is to provide a process for insulating electric or other cables, whatever their form and section, and whatever their contexture, rendering them cpable of resisting and withstanding in an e of the above mentioned .destructive agents.

My invention also covers the various baths 30l and the apparatus employed in carrying out the vsaid process. In the following specification -I will begin by describing, as an example, a method of coating electric cables adapted to withstand the above recited agents, except, however, concentrated acids. I will afterwards ydisclose `means'for rendering said cables resistant to such acids, and, lastly, I will describe, merely as an example, or as an indication, an embodiment of an apparatus for performing my process.

Electric conductors are generally covered with unbleached cotton plaiting, fairly loose.

but very smooth and even.

I pass such conductors through a hot bath very heavily charged with -drying oil.. Such a bath may be prepared, for instance, by heating to about 110 C., in a vat having a capacity substantiallygreater than the ,vol-

u me of its contents, the following substances:

Per cent. Drying oil 45 Grum resin 10 Pulverulent inert mineral matter 45 cient and long durable manner the action Stirring the whole thoroughly sol as to obtain a homogeneous mixture.

On removal from the bath, 'I draw the conductors through a calibrated draw-plate, the purposeof which is to leave only a mere film ofcoating on their surface.

This first bath is intended to fill and close the meshes of the braided cotton or other fabric insulation with an inert material, at the same timeshrinking the cotton through oxidation of theoil, thereby proofing the backing and facilitating application of the coatings to be superadded thereon.

I make loose bundles of the sotreated conductors and leave them exposed to free air for drying: 8 days.

Once they are thoroughly dry, I pass them through a second hot bath, very heavily charged with gum, which bath may be prepared by heating to about 110o C., in a vat similar to the first one, the following substances:

which takes practically from 4: to

Per cent.

Drying oil 5 Gum resin 30 Paraiiin 30 Pulverulent inert mineral matter 35 Stirring the whole so as to obtaina homogeneous mixture.

On removing them from this bath, I draw the conductors through a calibrated drawpla-te having holes about 5 to 10% larger in diameter than the first one.

Said conductors, so treated, dry very rapidly, and I then subject them to glazing.

This operation, which constitutes one of the essential characteristics of my invention, consists in drawing the conductors through a calibrated draw-plate, preferably made of steel, suitably heated (practically to over 100D C.) and having holes of smaller diameter than those of the draw-plate utilized after the second bath.

The purpose of such operation is:

1. To force into and compress in the very smallest interstices the constituentmaterials;

f 2. To melt the second coating, very heavily charged with gum, and to combine it with the first one, very heavily charged with already very much oxidized oil, thereby form- .ing in situ and within the very body of the backing and conductor-surrounding fabric, a

oil varnishes) which will proof the conductor in a ositive manner:

3. o impart to the whole a flexibility permitting any bendings, which are unavoidable in utilization of electric conductors, without any risk of cracking or breaking:

(a) By forming the flexible final coating,

(b) By eliminating any superfluous quantities of the second coating product,.always very brittle.

In order to obtain conductors proofed to withstand cold moisture and concentrated acids, I proceed in the same manner as above, (heating to about 110 C. and stirring) but the second bath is composed of the following substances:

\ Per cent. Drying oil 5 Gum resin 20 Asphalt 10 Parailin 30 Pulverulent inert'mineral matter 30 Furthermore, after glazing, I pass the conductors through a last bath, prepared like the preceding ones, but composed of the following substances:

Pel' Cent.

Asphalt 5U Paraiiin 25 Vaseline 5 Pulverulent inert mineral matter 20 have illustrated, as an example, an apparatus adapted for this purpose in the accompanying drawing, wherein:

Figure 1 is a diagram affording a general view of,a conductor-coating device;

Figure 2 illustrates the supporting and hleaitng arrangement of the glazing draw- P a vFigure 3 shows a draw-plate on an enlarged scale.

I prepare the baths in vats,preferably gas heated, and which may be provided with stirrers or agitators.'

Coatin is performed in troughs, such as the one s own at A on Figure 1, heated by an suitable gas, electric or other device B.

Y 1,682,07e' I through draw-plate H, combined with a guiding device E2,and is wound up on a suitable device, say a reel or a spool.

For glazing, draw-plate H is mounted on a holder or stand D (Figure 2). I heat it up to suitable temperature by means of a device B', preferably a gas burner.

The draw-plates are made of steel, and, preferably, rectangular in shape, as shown by igure 3. The draw-hole should have its lowest part at a contant distance from the base so as to ensure perfect centering, and the entrance aperture of said hole should be countersunk, as indicated at I.

y The above described apparatus is given, of

course, simply as an example in order to render the invention more clearly understandable, and it is, therefore, in no way limitative and I reserve the right to introduce any constructional modifications without being deemed to depart from the scope of my said invention.

I claim as my invention:

1.l A process of treating insulated electric and other cables, comprising thel steps of passing the cable through a hot drying-oil bath and then subjecting it to a drawing ac'` tion, so as to leave merely a thin film of coating on the surface of the insulation; drying the coated cable; passing it through a hot gum bath and then subjecting it to a second drawing action; and then subjecting the cable, after having undergone the second drawing action, to a drawing action in the presence of heat to cause the constituent materials of the two baths to combine and to force them into the interstices of the insula- 2. A process of treating insulatedelectricv and other cables, comprising the steps of passing the cable through a hot drying-oil bath and then subjecting it to a drawing action, so as to leave merely a thin film of coating on the surface of the insulation; drying the coated cable; passing it through a hot gum bath and then subjecting it to a second rawing action; and then glazing thecable.

3. A process of treating insulated electric and other cables, comprising the steps of passing the cable through a hot drying-oil bath andvthen subjectingjit to a drawing action, so as to leave merely a thin film Vof coatingv on the surface of the insulation; drying the coated cable; passing it through a hot gum bath and then subjecting it to a second drawing action; glazing the cable; and then subjecting the glazed cable to acid proofing.

4. Ina process of treating insulated electric and other cables, the ste s of passing the cable first through a hot drymg-oil bath, and subsequently through a hot gum bath containing drying oil, gum resin, paraffin and pulverulent inert mineral matter.

5. In a processof treating insulated electric and other cables, the step of passing the cable irst through a hot bath containing drying oil, gum resin and pulverulent inert mineral matter, and then through a hot gum bath containing drying oil, gum resin, parain and pulverulent inert mineral matter.

6. A process, according to claim 5, in Which the cable, after having been passed through the second bath, is dried and then subjected to drawing action in the presence of heat to cause the constituent materials of the two baths to combine.

7.. In a process of treating insulated electric and other cables, the steps of passing the cable first through a hot drying-oil bath and then through a hot gumbath, glazing the coated cable after it hasbeen passed through the gum bath, and then subjecting it to a bath for proofing it against concentrated acids.

f In testimony whereof I aiix my signature.

JEAN OCTAVE GOGRY. 

